Compensating superheater



Feb. 12, 1935. c, w, GORDON COMPENSATING SUPERHEATER 2 Sheets$hee 1Filed May 12, 1934 INVENTOR CHARLES W. GORDON. BY 0, fi

ATTORNEY Fgb. 12, 1935. c. w. GORDON 1,990,901

COMPENSATING SUPERHEATER Filed May 12, 1934 2 Sheets-Sheet 2 F1 g 4. 7:;g 5 4 64225120600.

Q BY

ATTORNEY Patented Feb. 12, 1935 i,99,0,9oi

CODIPENSATING SUPERHEATER Charles Gordon, Munster, 'Ind., assignor toThe S uperheater Company, New York, N. Y.

Application. May 12, 1934, Serial No. 725,265

' 5 Claims. (01. 122-480) UNITED STATES PA-TENT OFFICE Myinventionrelates'to the art of superheating steam.

A method and arrangement-for regulating the temperature of steam from asuperheater boiler 5 described in my prior application," Ser. No.580,290,

filed December 11, 1931, involves flowing combustion'gases through twopaths in the boiler'having unequal amounts of superheater surfacetherein and regulating the final temperature of the steam delivered fromthe boiler by regulating the proportionate amounts of gases goingthrough the two gas paths. Such method and arrangement have been usedwith considerable success. It is an object of the present invention topro vide an improved arrangement adapted to operate in accordance withthe method described in said application. 1 v

The novel features of the invention are pointed out with particularityin the appended claims. The invention, however, together with itsobjects and advantages, will best be understood from the followingdetailed description of a superheater boiler which is an exemplificationof the invention illustrated in the accompan'ying drawings and selectedfrom a'number of'possible embodiments thereof. In the drawings,

Fig. 1 is a sectional elevation through a boiler in accordance with theinvention.

7 Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig. 3 is a section on a line 3-8 of Fig. 1.

r Fig. 4 is a fragmentary detail of a'connection plate shown in Fig. l,and ends of units cooperating therewith.

Fig. 5 is a fragmentary view taken from'the left of Fig. 4. w I

The superheater boiler 10 illustrated in Fig.1 is of the double set benttube type having a com bustion chamber, the upper partoi which appearsat 12 and on one side of the vertical central plane 4 of which is asteam and water drum 14 connected by generating tubes 16 and 18 toawater'drum 20. Wall-tubes 21 also connect into drum 14 and extendimmediately in front of tubes 16. Tubes 16 form a group in front of andspaced from the tubes 45 18 leavingaspace 22 intermediate two groups oftubes-for a'downpass for the gases, it being apparent 'from the drawingsthat tubes 16 and 21 he in a zone-in which the gases pass upwardly Hfrom the furnace. Bafile 24 lies between tubes 16 50 and pass 22, thegases passing into the upper end of such pass around the top or suchbaffle.

At the side opposite the bafile 24 the pass 22 is defined by a bafile 26which extends downwardly from 14 but has its lower end spaced from thedrum 20 so that the gases pass around its lower edge into the group oftubes 18. Along the rear edge of tubes 18 is a bafile 28 somewhatsimilar to 26 and extending downpfrom drum 14. Ex: tending up .from drum20 and lying between baffies 26 and 28, is an intermediate bafile 30extending upward from the drum 20 but spaced at its upper end from drum14 so that the gases go first up and then down within the tubes l8,'andpassing around the lower end of the bafile 28, the gases llow' upwardlyalong a group of down comer tubes 32 which connect drum 20 with rearsteam and water drum 34 which receives the feed water. Connectingnipples 36, 36 run from the upper part of drum 14 to'drum 34 to conductsteam into the latter drum. The gases which have passed upwardly alongtubes 32 pass therefrom and over nipples 36 and then out of the boilerinto the duct 38 inwhich is aregulating damper 40. Steam from the drum34 passes out through nipples 40, 40 into a header 42 for saturatedsteam V I On the opposite side of furnace chamber 12 from the boilerparts above described, is a similar generating section having parts,manyof which are exactly alike those already described. Such like partshave been given the same reference characters as those in the boilersection first describedpexcept that the parts in the second mentionedsection are primed. Except as about to be mentioned, the construction ofthe sections of the boiler on the opposite sides of the'combus tionchamber 12' is the same, and the second mentioned section needs nodescription in detail. It will be: seen, however, that the bafile 24'has an extension -25running inwardly and downwardlyparallel to the tubes16 so as to restrict thewidth of the down'pass 22 as compared to thewidth-of pass 22; The purpose of such restriction will presently appear.For guiding and supporting the baflle extension 25 the boiler section onthe left side of chamber 12 has an additional row of tubes 27intermediate the group 16' or the group 18';

' The superheater associated with the boiler 10 is also divided into twosections. Such superheater sections, however, are; not divided equallybetween the two boiler sections. One section of the superheater hasinlet connections running from the saturated header 42 downwardly to agroup of serpentine superheater units 52, 52 interspersed between thetubes'16. Units 52 are looped up and down substantially in the spaceoutlined by the tubes 16 and associated groups of tubes 17", which runup .in front of them and form theextensions of generating'tubes on thewalls of the 39 of 22.. Units 52 and 521) are of the serpentinecombustion chamber. The outlet ends 54 of units 52 extend upwardlysomewhat in the rear of the inlet ends and curve downward so that theirends contact with the upperface of a connection plate 56. s

V In the space outlined by the groupof tubes 16' 7 and 1'7 is agroup ofsuperheater units 52 substantially like the units 52, their upper, ends54,

however, extend upwardly so as to contact with the lower face of theconnection plate 56'. Contacting with the upper face are ends of a groupof jumper or extension tubes 55 which extend across toward plate 56 sothat their other ends contact with the upper face of such p late. gItwillghe understood, of course, that plate 56 has suitable aperturestherein so that steam ,:can pass through them from the upper ends 54' ofunits 52' into the jumper tubes 55, the construction'of' plate 56' beinganalogous to that illustrated in Fig. 4 which, shows the plate 56. l v I7 At the plate 56 units 52 make connections with the inlet ends a of a,group of units 52a, 5241. Similarly thelunits 52a make connection at'56through jumpers with theupper ends 50b, of a group of units 52bv (Fig;3)' .which'lie intermediate .theunits 52a.. Units 52a and 52b lie in-thedownpass .22, such pass having .a greatercross section than pass 22' toprovide room for the units 7 52a and 521) without increasing materiallythe draft loss in the pass 22" as compared with that type and haveoutlet ends .520, 520, which extend up to a'he'ader 58 for superheatedsteam. From header 58, the steam is-conducted to the pointer points ofuse; I r v It will be seen that the total superheating surface of theboiler 10 is "divided into two sections which provide paths ofsteamflow. betweenthe headers 42 and 58; 'One section is composed-of thegroup of radiant units 52 and a groupi of convection units 52a connectedthereto in series while theother. section of the superheater; iscomposed of the group of radiant units 52 and-thejgrqup of convectionunits 52b 'All the strictlyf convecr tionlfunitsv 52a and 5i2lzjare,however, on one side of the-furnace chamber ll so that. much thegreater Iportion of 7 thelsuperheati ng surface 1 lies in one of-thegaspaths through the. doubleset boiler 10 namely the one including. thepas ,s,22 Therefore,.by "adjusting the dampers-41 andfl so as to throw agreater or lessproportion-of the heating gases throughthe pass- 22, thetemperature --of the steam at 1 the :header, 58 cangbe held constantwithin very; wide load limitsv Atan as,-

, sumed'high load close to .the'maximum fora given boiler, thefinal;steam temperature-{will be at;

tained with an equal flow of heating; gases through the two halvesof the,boilera At suchJoad-point dampers4L and:- 41'-will-.botb;,bewidesopenin the. position.- illustrated in l. ;.'I'heregulatory,,effectof theunits 52aand52b.is:relativeh greater whentheunits=,52 and 525m theradiant-or semis radiant position I aresubstantially unaffected by changes in: the proportion .of gases.flowing through pass 22 and 22" respectively. .=I have,,,therefore,arranged the 'baflles24 and 2'4'zsoas to form/a relativelynarrow throatat the point,60 at the upper end of the combustionchamb'er12 and haveplaced :thefserpentine portionsof units-52 and52 all below said. throat,onlythe connecting ends .or leads of suchlunits namely .parts 52,15254,,54' extendingabove such Lthroat. 4. As iscleanfromthe drawings, ,manipulation,of dampers 4 1 and ,41' can havelittle or no effectinthrowinghthelgases 1 towardigronp. 2 or52 f,,but;hasa largeetiectinthrowing a greater or less percentage of the gases over the groups 52aand 52b in the full convection position, Y However, I do not limitmyself to using radiant groups of units of the same heatingsurfacebecause in some boilers all the surface may be placed on the furnacesides of the baffles and in such cases my invention requires that onesemiradiant group shall have materially more surface thanthe other.

'WhatI claimis: r c

1. The combination of two substantially similar banks of generatingtubes inclined toward eachv other to form an upwardly tapering gas spacesaid banks and opening on the opposite sides thereof from said space,said banks having each a front group of tubes through which the gasesflow upwardly; means-l forming a down-pass behind each of 'said frontgroups, a superheaterhaving means forcontrollingithe gaslflowthmpneotmid uptakes independently of that athru othergw;

2. The combination ,with a; .doubleesetxbente tube; boiler havingigroupspf =vertica1lysinclined generating ttubes on each-Aside; ofan upwardlytapering combustion spacaz baiflezmeansafmming a pronounced throat.neamtheuppemend of said space, two groups of semi-radiant serpentindsusperheater :um'ts interspersedeamong generating tubes at opposite sides;of said combustiomspace and having-their 'serpentinegportionssubstantial 1y below.v said; throat. and; additional .groups serpentinesuperheater aunitsadn an "entirely (con-a vection positiomat one.sideaof said combustion .therebetween,=itwo gas off-takes, one for eachof space,:;;one,- of said groupsgof unitsybelowssaid throat connected.in series .wvithqone; groupsin the completely-convection position,andthelzother of said semi-radiant. .groupsrconnected in series withanother groupxin theieonvectiomposition; the two zpairs zof groups :inseries: connectedi to form ,two'steam-pathszma parallehmnd meansforvarying; the proportion of. gas .flowlpassingzOVeI1'S8id381011DS in.thelcompletelyc-comecs;

tion position to maintain the finalistea'm teme peratureat,aidesiredpointzru; V v .c 3. The combination in a double-setsbentetube boiler ofanlunwardly taperinsnombustiomsmce, two rgrounsmfserpentineusuperheatennnniis: in semi-radiant: flocaticnconcnppositaiseies: of said space, two gmupssot serpentineisuperheaterunits in as ccmpletehtacpmectimm location (on .unmzside of,saidrspacmzand:memforzoonneciiingame I saidarsemi-a'adiantmgrounszin;seriesriwithl one iof said-convectiongroups,:and-.mransforieonnecting isaid semi-radiant-groups andedumpereonnecting tubes betweensaidrplates,both said groups of convection units having ,said secondmentionediconnectionlplatelflu r 4. The combilia i n iIlQ -,-doubleset-boiler have;

ing an upwardly tapering combustion space or a superheater having twosections connected in parallel, one of said sections having a group ofsemi-radiant units on one side of said space and connected in serieswith a group of convection units on the other side of said space, andthe other of said sections having a group of semiradiant units on theother side of said space from those of said first section and havingalso a group of convection units in series with its radiant units but onthe same side of said space, whereby the amount of superheater surfaceon one side of said combustion space is materially greater than that onthe other, and means whereby the gases for heating the boiler can bethrown in greater proportion toward said convection heated portions.

5. The combination with a double-set benttube boiler having groups ofvertically inclined generating tubes one on each side of an upwardlytapering combustion space, baflling paralleling in general the planes ofcontact between said groups in said combustion space but lying outsideof said planes of contact to direct the gas flow in an upwardly taperingpath, two groups of serpentine superheater units interspersed amonggenerating tubes at opposite sides of said combustion space, one suchgroup on each side of said combustion space and lying between such spaceand said baffling, and additional groups of superheater units in anentirely convection position on the side of said bafile removed fromsaid combustion space, one of the groups of units on the furnace side ofsaid baffling connected in series with one group in the completelyconvection position and the other of said groups on the combustion spaceside of said bafiling connected in series with another group in theconvection position, the two pairs of groups in series connected to formtwo steam paths in parallel, and means for varying the proportion of thetotal gas flow passing over said groups in the completely convectionposition to maintain the final steam temperature at a desired pointthroughout a'wide range of load.

CHARLES W. GORDON.

